If you want it to look like factory, just use a base coat. No need for hardner or clear. Its a little more delicate, but easy to touch up if you do scratch it. Depends on what look your after. Cecil...........

1953 GMC 5-Window Longbed Gallery page
1946 Chevy 1/2-Ton
Webshot photos, including 1951 GMC 1/2-ton